interpolation limit
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I am trying to interpolate a ascii grid I created in GIS from a 5 ft DEM into a grid in GDS. When I try the new method of doing it, none of the cells get any values when it is finished. Is there a limit to the amount of points? The DEM covers 65 square miles and the ascii grid file has 80 million values. The current grid I am using has 200 ft grid cells but I may have to drop it down to 100 ft grid cell sizes.
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1. Did you use the instruction guide you can get it on the website:
http://www.flo-2d.com/wp-content/uploads/FLO-2D_GDS_New_Interpolation_Method.pdf
2. Make sure the data is space or comma delimited and remove any tabs. If you are an ultraedit user just click Format/Tabs to Spaces. I suggest using space delimited. You can do a find and replace to get rid of commas. I only suggest this because that is the way I did it when I interpolated my multiple data files. That was over 100 million points onto 1.97 million grid elements and it worked very well and only took about 5 minutes.
3. Make sure the data file has the .txt extension.
4. If the interpolation is not being performed it might indicate that a data point is invalid. I don't know if there is a data validation yet. You might have something like a shifted decimal or a shifted line that makes your data run together.
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